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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87feba501a9fb35eb0958f2157bd26cc0f5dd60feb1e848fe367d7756b45a675' 
  AND token = 'I2xzHatJ+YvACUTPfO9q8BxYK77PLNIdthcALHMXvRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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