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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e648579fcb6a0144385a7119ae5a8d0b15fb2579a34b79df906006165fdc14' 
  AND token = 'e2/tyf/lOT4YQma5wToU/+qyueFW/8hSvvu3vs2Gh2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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