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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c567ec050e699673b345ee2b6618b544f35024947f0b5f22db2abf89892cdb94' 
  AND token = 'QLI/t9RuDvR3iCY7vEgKiH2/pCL6RyxA0HtAhF7323U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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