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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c350f5477c8e107838b472e09dcded11be64b0dfde957de753afc4240d04de0' 
  AND token = 'EOLnGJ8X7F5xaB59eNilZq1m26awGbhg4EOUkopD2Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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