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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1108a80754e801c19d27c93173e30585cb64b0a98b89a389b34b2d74b1e5d8b' 
  AND token = 'K6lqshDySulJ29nRp6Jr2CuqreCA6nfCpZbyVLippQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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