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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d233f331739512d6de03992cb994d9bc03c8d6c420a75a79f287e4448b695f' 
  AND token = 'ss/PEyg7xfg8aCCvNqySGV0FRwSF/yMEMyXide4cF2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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