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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448d394776d4a74dd3cd0c1c96c07141c5ab19a5d0211166f1898499fc73e236' 
  AND token = 'PI84qrebXaseet5Tuhi2LmX6FWv9n2Sx+rH2eSv83Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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