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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34c8ecd5dc6a85304005d9fbb56b31ad2ef08b49ac913dddc22bf0622f7b7b9' 
  AND token = 'JY+dMG+TAscY+O1Qh7cN/0/bdLbVbJn9Wr90QLjJnf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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