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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a91b93a440bcf85507536763a71e0d5c36ef26408418c3650831b0a697055c' 
  AND token = 'x2LF8kiJ3fEdt+5W4s0yGnqm3PnUk4PauLI94AORUE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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