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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a190ed986e4983ef8d5c2c5de7dea194bf5fbc719aa39d8cdac75edf9bca2d5f' 
  AND token = 'wug8NMBuJq9Ym1+BYpJEwswansmCOqB8u2TTxmppb38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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