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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987a4f635f25d4df8a98e06852674f89366dcec83bc17f55332f8012f259caa1' 
  AND token = '8CD6oC/Jos+3sTEvT55CVlcLCfWRd3Fb+qiQcdYu+7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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