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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5449b860a0b2c7f31159e603534da4c19b4c85d930318dbc30dae7d1ecc399' 
  AND token = 'AXHL9qxwtYOfK8z3OkmDByk/lthmOko6kZhXeNqsark=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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