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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da495b91cbea34e5926c6df10c5a218e833ee6c1bd8b5c4605f463b1c9dd43e' 
  AND token = '+Nl5KFmx25nATYnrfpbynbJuJMIdY/twZVpiLilLYWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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