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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358c28109520ea448a038de0b6637eeb94aabb1de5569821cec8e436726e3bfd' 
  AND token = 'L/uSE/WEnA5IbZr/p83HwXjVgXT4x1Xo8Y1va8ZFPn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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