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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126b1e62596114b8044372e6f06e7592cb9378c670e0bd4309c7ed69eeb00793' 
  AND token = 'I1odGldIPZ0BiZ3orwGdCqO2N9cnezuMyrNAuJnddcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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