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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7ca65c00a1bb97cf61f7469413448b89058f3f7ac1ca60c23f8c02f731a64e' 
  AND token = 'elGB50SMEJBLclj8IVzCyxXW7pmGbCF8nS+in2blkVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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