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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc80c5bd2b751c9416aeef3cfc80b991fb45f0f203a8dd7e55a1d559fedaccb0' 
  AND token = 'sdt1MEahB8VqJpYB5v39M0N0q9HKcD6mt+luBb6r+ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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