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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b522784f79718d4d985021c15e785e562554888aecb7635117e032aa64c1cd0' 
  AND token = 'fVNbK2mC10aiiuY3qYLUrK3Nl9YlkU6Tp90LQnRRssU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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