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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb966554dfe474057ff6ac9301050eaef192dca0f08efef65627508a8f61722' 
  AND token = 'rn8c/xPsEUS/JD931nhOzYZJzAktJ1WS/ymQP6uwMJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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