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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e3813b33bc4b21b78e3e43e19e67c757b229c56db78243ce91b60531f1fe72' 
  AND token = 'wPaw2auSmkJojhu3lsD0Nj22Vsz1Hd15qcw7G64LM/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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