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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7d23ab0e7c3b9b719a5ff326284fc666884770bbdc60de684598d46de76f33' 
  AND token = 'm6IW6CaakxZCpQOe/15gaYk+n8UaBd8oRLqVHhhuLFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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