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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed83cb9df2cb6fb0758dcbb5ce6ae33cf6f2bbd41fe9d8dc04aaacfc29fdbe95' 
  AND token = 'nbLMfVo6/GzObmliz5tqhQZWhDeMzxRGgI+7c0PUycM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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