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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ceb1661a90397128dd79e5c8d30d5e02f067c991364144f8b89ba04a64eeebc' 
  AND token = 'OP1xu1GvmOluvuJhmkG2f50HRpbWFJ42q0I+THgyNC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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