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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45f31ebbee48eb130bc6fe489220a1214c6592a3de4573583c4e1721ced16a1' 
  AND token = 'BInIxUNEXMbGG0qko/980SEUlYrFKa4WZJPoMuIhHMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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