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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03cdca8546dea5f5bd38078760ab1ad75a8fe64556c1962f7c954e887fb3eb46' 
  AND token = 'ZmxpliCeaNvGYycllAeI8oxUrwVVtEB8qtqZmhSfqQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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