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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc19bc165a01c92d07766d2a62ff68792009ff2ac3888fdb9651f3b231bb0a33' 
  AND token = 'xtjvSxbgOwq/mabSFfrab4O84DXvC5o3i32coxNLjes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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