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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc4c7040d5ea9983e49b8ed0e8ef023d9d03bce8e03435fe53342c87386d1d9' 
  AND token = 'x+HDnVJmFjJ379nEaQxPkfGHtshuXUPrSKxVTA49RSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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