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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735b0a4ee7c942192bfa5e7610f8030656d916336fa766b9d1e5eadbd6e84d8d' 
  AND token = '6a4JVzWFkfdmWBGhG5P3A666i0s9iNSYvVosnKEP5uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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