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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68e07d4ac2ce75354c28a78b09cd2f60e17fddfa7d0439ae6e8a658003d6584' 
  AND token = 'BLsS0rzJUZyOv+Rr6NIt5+cDennlCKDM+Tna1dJ/ZzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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