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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9b88eccbe4b16822a6aa4861c7bbbe3c230c8a23ce05e769edc34dd30fd9c6' 
  AND token = '/jKeyiqH5BG6bAL9sJWkbg0vttuKJnc9GmGTIMoKC2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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