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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb4294d631c0464f0a74d13e8078860b7f3ac7eed75d04b18d63720b667e527' 
  AND token = 'aqmoCSPQWltLFEAWe4R5zcnyUB1ft17HkN+WOUCjnHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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