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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffc0082fc0e789ebb2fc80c6e81ac76a9661ac0a56c502b05ec5560bf729ec7' 
  AND token = '1nB0y637kzujDpqoY/QwING87HuV8uj6mUMJarpldog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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