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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c1dccbbeb7abed22508a618de10ca29fc240e027ea231e33703f79d9becf77' 
  AND token = 'U/b/njclIjwaXkolk9tMdu8Xt8huHuMHw0IMMB9azlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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