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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d26bf93d8eeac0d6601ee9992f8f2d1b11b2af1622a6875d3071d06b9696ec' 
  AND token = '+ZcpWfkEm2xI6sKBeJ0YvkpUd1e3LCdaqfRr4qF6O6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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