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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9aad706579abc29e51ac14570e42f74d65f2ef32a08f285f2177413036eb801' 
  AND token = '27D2IIU2mLgeY6CR0L5xpXKCLhSGC9b5h18ACn1LfUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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