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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284e4658f26907dd42341b6807501b08b7385712f3533ac8d83559dd19c15388' 
  AND token = '/aAQNfxvFeQIKmtCdAe/mhZl1cu/cVG9eGBAWG/NDcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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