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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edb47ce8477017a368a0e3f719a63460e2a11f89e8b7b1a63c39ec26254b5a5' 
  AND token = '3fJJ2BtTsQR8tSD2pwR00WnBrSCVKOb4VMNDt4VK+ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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