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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b695cadf71e64676abd7d9c30089aa45181c3e03c8146b0b483cb0b69947b2c' 
  AND token = 'xxne9w6igEvHvg7A6ARZSnGDrhfBFgcjwOrI5usBrjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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