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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c26a5c70821fcf7c03f7ac105e3a918a4759b096945b0bb74b028cb1ee4a1a50' 
  AND token = 'CNVt/TIhUqpXxOKk9yFboq6q7s4xyaclb/Un2wsQjlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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