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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcefba18e75f7e95ed5cfa3ff9c169eb92297f6da1ae4eae04eb4cfc3998052' 
  AND token = 'M8Mp9tRgGQbemJARQk+4AyMopnsE3Ii0o96JZXZzkLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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