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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee127f092559dfdfbf1689014ad76a8d4e3682b2902865c965f6282428826765' 
  AND token = 'KI79Dxs1Ueqg28T7383hiV5YABEyj75xqEISUH4Ahc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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