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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798b2a8f46798167cbf996cf0132a5a6dea87dc090c2a9727d6d7b7804cb61f7' 
  AND token = 'fkNqOudsK84JfS4uKLqHwlUu8LA8gDBHqWg4c/bVJuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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