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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a962af086c9f56438ceb4bb9538332d6aaf9ccb30a95002a3b03fdaf3b0b193d' 
  AND token = 'LFRbbG6HVv7k1Cz8g9GZY63kYJrkOnPM/Q3bEp91Izk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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