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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebee8215fa5bd63ba3ad97b0867bc30cd8c3237c74cd5bfe120932eabfdf1ae' 
  AND token = 'Ur7j+DrL3+HP7AVTj8Xy2G6/5adGVF7RpE2LXogn7Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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