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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c671a65a030a6ad26bee612acfdf735279d0af8b6d82b8aa231df52fe59afadf' 
  AND token = 'dCb6Y7iBVvVBRC9j8kMCmc+UvgTsIOYYYU5qjGp/tjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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