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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aaa2f7438fbf369175a44e06e0b9e36403c2c970df2c3408441048bcdcd7aeb' 
  AND token = 'gt0E5+OgCu3a6G0xIBLOlH8CMKIm/V98mRXLp5ON+q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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