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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc35ab6a70928aef12faef8983cf1bdf2e78de1b826c9db227fb8469859b657' 
  AND token = 'wpaNjSBE90anW1X8GcNNQHwSGwzhAJShU1ly5cFvFks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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