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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c63feaa1ee2f95ad721b02985a739e9b0feed9d6dc4a2ab27519860a2d4214' 
  AND token = 'bCt1a06Bzq/ig3sNRbQ/v9cJIpg+TFsxpNhbif1fyko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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