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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1c6202b85b7dcf2a1037a7855a491f3623891e2cf5ec3a05c576197989ec25' 
  AND token = '08BKT+eXqYeS2om5547/PrKyvzZ0rMNFtBDgwqBMlxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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