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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22bb270c79679dd7dffc7456af113b34489ffb08609bbf12b4a2e282351f2d1' 
  AND token = 'c8lCtMhc7zbXJgVSKux1ZOVpWHyi1uHosLqFrs8NUEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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