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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a02c0f6d6fad8742e6ae9ac000317391e23ace875f6e714021d0bd3e572046c' 
  AND token = '5xOLzA2RC8H69kC0QB6hIjZoPjZ/1Y4uaG2IP5AJZcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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