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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88010d09200ea3654fd61d9a855528fa28d713d6ca30961504b3c997fd18f252' 
  AND token = 'mkZjXsUuPCe73/EHO1LKnaCpOvtczXlUOs7QAM7Ewoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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