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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daeb5e49dd2ef5d5355bd69686a2e7f6a09362bd80b62127891844ecd383c7ec' 
  AND token = 'eyA1b0gEyesgRzp9xTj1P4MRKkPd1/dgAzOz38GaVzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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