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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14628564619f832d6b38c4e219208bb80b3e6958fab906de3500d14beb292df9' 
  AND token = 'CQcXEz1DTw5iZMrysIhi21a7HW+Jr+uD4Srl7VhvlTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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