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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7261ea16ae81e1622c2ca61981966ce15eeadad04ee5e532340c0342d15dbfd' 
  AND token = 'T2lu24Md86cN7wm231rLF2D1cEKFyttxrjd5lXTcGZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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