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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd788f78013a1197e977060cb9124d89e3052c59ad2d6cb21cbbd488101d339' 
  AND token = 'jshkMdGDaCkHN7Ot/I5E8F91ssuFkK0juLFNQK4HhDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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