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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a8d6cb12c76f18491cafb1eeea86a1ad58b8798f1fa11681f1dfb8e20fcd51' 
  AND token = '2L3J5alnRkfRCuq0YwF0pjSvwPZs0DbO6zS5vsNrnUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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