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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a4a8ca30caa0966510495d6c2011d7a5a7ac1f31113cfe44fbb559eaee9ec0' 
  AND token = 'eBLPuEUo+OmQmq2YlwsLgjX3Sq3GrXiza716i0xMa+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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