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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003175f3e01bdb99ba6ee21981d801a06187b34f5fe19961a1d786bfab017b7e' 
  AND token = '9Ze1Y91sxh2i+27VlWVO2RXzhYc4Fj9r5CS0fqodTKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}